[Bug tree-optimization/64322] More optimize opportunity for constant folding

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64322

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2014-12-16 00:00:00         |2018-11-19

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #9)
> Can the bug be marked as resolved?

Did you check?  At -Os we now produce for A

        movq    $0, -16(%rsp)
        movl    $1, %eax
        salq    $32, %rax
        movq    %rax, -8(%rsp)
        movq    -16(%rsp), %rax
        xorl    %eax, %eax
        ret

that's not folded (the shift).  It was worse, yes, but it's not fixed yet.